from typing import Dict, Any
import cv2
import numpy as np
from app.utils.logger import get_logger

logger = get_logger(__name__)


#  公式识别模块

class FormulaRecognitionModule:
    _instance = None
    _initialized = False

    def __new__(cls):
        if cls._instance is None:
            cls._instance = super(FormulaRecognitionModule, cls).__new__(cls)
        return cls._instance

    def __init__(self):
        if not self._initialized:
            logger.info("Initializing FormulaRecognitionModule")
            self._initialized = True

    def recognize(
            self,
            image_data: bytes,
            format_type: str = "latex"
    ) -> Dict[str, Any]:
        """执行公式识别"""
        try:
            # 将字节数据转换为OpenCV图像
            nparr = np.frombuffer(image_data, np.uint8)
            img = cv2.imdecode(nparr, cv2.IMREAD_COLOR)

            # 公式识别逻辑
            if format_type == "latex":
                formula_text = "\\int_{0}^{\\infty} e^{-x^2} dx = \\frac{\\sqrt{\\pi}}{2}"
            elif format_type == "mathml":
                formula_text = "<math><mrow><msubsup><mo>∫</mo><mn>0</mn><mi>∞</mi></msubsup></mrow></math>"
            else:
                formula_text = "E = mc²"

            return {
                "formula": formula_text,
                "format": format_type,
                "confidence": 0.95
            }

        except Exception as e:
            raise RuntimeError(f"Formula recognition failed: {str(e)}")
